期刊
CHEMICAL SCIENCE
卷 6, 期 10, 页码 5623-5627出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc01307k
关键词
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资金
- Australian Research Council (ARC) [FT100100320]
- ARC Centre of Excellence for Electromaterials Science [CE140100012]
- Australian Government Endeavour Award
Time-dependent fluorescence spectroscopy has been used to demonstrate significant pH-dependent electrostatic effects on the kinetics and thermodynamics of hydrogen atom transfer between 1-hydroxy-2,2,6,6-tetramethyl-4-piperidinecarboxylic acid (4-CT-H) and the profluorescent nitroxide {2,2,6,6-tetramethyl-4-[(7-nitro-2,1,3-benzoxadiazol-4-yl)amino]-1-piperidinyl} oxidanyl radical (PFN) in dichloromethane. This pH switching does not occur when 4-CT-H is replaced with a structurally analogous hydroxylamine that lacks an acid-base group, or when the polarity of the solvent is increased. These findings validate our recent theoretical predictions that electrostatic stabilisation of delocalised radicals is of functional significance in low polarity environments.
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